- Series: X-Men: Nonfiction Series Record # 40131
- Sub-series of: X-Men Universe
- X-Men: Nonfiction
- The Science of the X-Men (2000) [NF] by Karen Haber and Link Yaco
- Secrets of the X-Men Revealed (2006) [NF] by Robert Weinberg
- X-Men: The Characters and Their Universe (2008) [NF] by Michael Mallory